Tapping-machine for stay-bolt holes



(No Model.) 2 Sheets-Sheet 1,

P. BARNHAR-T. TAPPING MACHINE FOR STAY BOLT HOLES.

No. 441,737. Patented Dec. 2, 1890.

Wz iizesses Per WWaaM (No Model.) 2 sneak-sheet 2.

F. B-ARNHART. TAPPING MACHINE FOR STAY BOLT HOLES.

No". 441,737. Patented Dec. 2,18%.

wz iness es" I g gm Q2014! UNITED STATES PATENT ()FFICE.

FRANK BARNHART, OF \VARREN, PENNSYLVANIA.

TA PP ING-MACHINE 'FOR STAY-BOLT HOLES.

SPECIFICATIN forming part of Letters Patent No. 441,737, dated December 2, 1 890.

Application filed September 4,1890. Serial No. 363,949. (mi model.)

ing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to universal tapping.

machines, and particularly to that form of such machines as is adapted to be used in tapping stay-bolt holes in steam-boilers and like uses.

The invention consists in certain new and useful improvements in the construction of the type of machines above named, as will be hereinafter fully set forth, and pointed out in the claims.

The invention is illustrated in the accompanying drawings, in which Figure 1 is aperspective View of a universal tapping machine containing my improvements. Fig. 2 is a vertical sectional view of the machine, the line of section being in the plane of the axis of the stock-shaft F. Fig. 3 is a vertical section view of the devices by which the machine is supported, the line of section being at right angles to the line of section in Fig. 2.

The construction is as follows:

A A is the frame of the machine.

B is a sleeve connected with the frame-piece A, which contains the driving-shaft.

O is the driving-pulley, O the driving-belt, and C C the sheaves over which the driving belt or rope passes.

D is the driving-gear.

I E E are the driven gears.

F is the stock-shaft.

G is the tap-stock.

H is a sliding clutch.

J J is atelescopinghanger. J isthe trunnioned head of said hanger. K is a swiveled yoke supporting said trunnioned head and hanger. L is a hanger, which is attached to the ceiling and supports said swiveled yoke.

A and A are the handles by which the operator holds and directs the action of the machine.

The frame-work consists of the hoop or band A, the arch A, the handle A the sleeve B,

the bearings for the shaft F, the lugs or brackv ets A and A and may be formed of one piece of casting. The part J of the telescoping hanger is secured to the arch A by bolts, which pass through the slot at insaid arch. The part J of the telescoping hanger is at tached to the head J and it is pivoted to swing on the points or trunnions 1e 7a, which are screwed into the forks of the yoke K. The yoke K is swiveled by its stem K in the hanger L, which is secured to the ceiling or overhead timbers. In the telescoping hanger there is a rod 7", which has a head j at its lower end and a cap j at its upper end, which seats on a spring 3' A binding-screw j is provided, by which the telescoping parts can be held at any point against slipping when desired.

ported largely by the driving-rope C, the op erator being able to raise and lower it at will; but if the rope should break or run off any of the sheaves the machine would drop and the telescoping parts pull apart, except for the headed rod j, the spring j serving to cushion the weight of the machine when it is thrown off upon the rod j. The binding-screwy can be used to prevent telescopic movement of the parts J and J when desired and hold the machine against vertical movement. The part J of the hanger is attached to the arch A of theframe-work by bolts a, which'pass through the slot at in the arch. The machine will ordinarily be hung so that the stock-shat t F will be at right angles to the telescoping hanger; but sometimes it will be desirable to have the stock-shaftF set at an angle to the said hanger, and when this is the case the adjustment can be effected by loosening up on the bolts a a and resetting them when the frame is turned to the position desired. It will be seen that the hanging devices will permit the machine to be turned horizontally to any direction desired, the telescoping parts J and J serving as a swivel, and it can be swung in one direction on the trunnions K K and in the other hen the machine is in operation, it is supwhich are 011 said driving-shaft,'tl1e stock shaft F, whichstands at right anglesto the driving-shaft, the pinionsE E, which are loose upon the shaft F, the sliding clutch H, which engages with the shaft F by a feather f and is moved by the lever A which is pivoted on the bracket Afland the tap-stock G, which connects with the stock-shaft F bya universal joint g. By means of thetwo gearsE E,both of which engage with the driving-geai-D and thersliding clutch H, the stock-shaft can be made to run either way, thus enablingiansoperatorto run aitap in:and hack itont at will by properly moving :the lever A In the bracket there is aseries of pin-holes a?, and ion ethe lever A there is. a catchqpin i operated by'a (hand grip-lever a1, which will engage with saidholes, whereby the lever A can :be set so as to hold% the clutch ll: mid waybetween andoutof engagement withsboth ofithe gears :E Eor in engagement with either of them,

as desired.

hat I claim as new rlS 1. In.a universal'tapping machine,tl1e combination; substantially: as-setfo rth; ofa If ramework having proper shaft-bearingsithereon, a driving-shaft and stook-shaft-setat right angles to each other, aibcvel:drivinggear and two beveled driven gears movedfroni said driving-gear, which run loose upon the said stock-shaft, a clutch device whereby either of said driven gears may be engaged with said stock-shaft, a driving-pulley on the drivingshaft, and a universally-acting hanger for snpporting'the above-named parts.

2. In a universal tapping-machine, the com bination, with the tap-operating gearing and its supporting-frame and the uni\-'ersallyjointed hanger L, K, and J of the intermediate or connecting telescoping partsJ J.

3. In a universal tapping-machine, the combination, with'tlietap-operating gearing and its supporting frame and the universallyjointed hanger L, K,-and:I of the interme- -diate=or connecting telescoping parts J J and the contained retaining-rod j.

4:. ilniauniversalatappingmiachine,=the combination of :the riixedrhangeril the yoke K,

swiveled in said hanger and carryiugithe sheaves C ,'the block-L E, trunnioned in said woke-and telescoping hanger .IJ, supported 'by said'block, the frame A A, supported by the saidtelescoping parts, and theitap-opcrating gearing supported in said frame.

Intestimonyiwhereof liafiixnnysignature in vpresence of two witnesses.

FRANK B ARNIIAIVI.

Vitnesses:

.TNo. K. -IlALLooK, 'WM. P. lhmns. 

